<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>{% block title %}{% endblock %}</title>
</head>
<body>
公共内容
<br/>
{% block a %}
	基模板的块内容
{% endblock %}

{% block b %}
	aaaa
{% endblock %}
</body>
</html>